my friends
I have problem with power supply circuit , output
voltage is (-6.5 , -1.5 , +4 )
but when make test for (7912 )it is ok.
note:
1- I connect circuit POWER SUPPLY
separately from main circuit
2- my friend tell me must be exist center tap for a achieved the GROUND POINT , but your are know that it need AC power & ( transformer)
pleas tell me where is the problem
jamal...




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